The phrasing of this phrase is a bit confusing. I want to understand it as "You dont want to study spanish." I guess my phrasong would be correct if there was a period at the end and not a question mark....just something to consider..

I typed, "No quiere estudiar espanol?", to which I was corrected: "No quieren estudiar espanol". Yet the English cue was, "Don't you want to study Spanish?". Where am I supposed to detect the plurality in the English translation?

I'm reading through recent comments and it looks as if my issue is a new one. Anyone else share the same error?

Eons ago, in high school Spanish, we learned that the name of a language is preceded by the definite article (maybe always "el"?). Duolingo accepts, but does not require, the definite article. Which way is more common, now?

I think definite articles are used when languages are the subject of a sentence, and are not used when languages are the object of a verb. I'm not really sure why Duolingo is accepting the use of the article here.